Modification of the classical Heisenberg helimagnet by weak uniaxial anisotropy and magnetic field

I. A. Zaliznyak, M. E. Zhitomirsky

Classical ground state of the isotropic Heisenberg spin Hamiltonian on a primitive Bravais lattice is known to be a single-Q planar spin spiral. A uniaxial anisotropy and external…